How about a system that seems to work well in NZ.
All aircraft are ZK-xyz registered.
NZCAA certifies two organisations to run Microlight (Ultralight) Training, Certification and Maintenance etc.
One is a club type organisation RAANZ (Recreational Aircraft Association of NZ) similar to RAAUS and has an annual membership fee and committee etc.
The other is a Corporation and is run as follows:
Sport Aviation Corp was established in 1995 to provide service to sport and recreational aviation in NZ.
Sport Aviation Corp (SAC) looks after Microlight (Ultralight) Aircraft activities via a structure set up through out the country of Authorised Testing Officers - Instructors and aircraft Inspectors.
SAC is certified under the Civil Aviation Rule Part 149 and is responsible for the flight standards and training of Microlight pilots and Instructors, as well as aircraft maintenance standards and training for aircraft inspectors. SAC is a seven day a week aviation business. The direction of the company is under the control of the CEO and two other Directors. The day to day operations of SAC are audited by the Civil Aviation Authority of NZ in line with the SAC Exposition or procedures manual approved by CAA. The aim of SAC is to provide a high standard of training and safety, a fast efficient service, and keeping the fun in aviation with minimum regulation. Our representatives throughout NZ are of the highest calibre, many from commercial backgrounds and general aviation, some are early pioneers of the sport, drawing from more than twenty years experience in NZ Microlight Aviation.
There is also an annual Fee to the Corporation similar to the RAANZ membership.
As all Ultralights are ZK registered they can be flown by anyyone issued with a pilot certificate by either organisation.
Cheers